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RF filter calculator-Lowpass calculator,Bandpass calculator

This page of converters and calculators section covers RF filter calculator. This page on RF filter calculator covers RF lowpass filter calculator and RF bandpass filter calculator.

RF filter calculator-Lowpass filter type

Following is a simple LC based RF lowpass filter calculator of order N equal to 3.

Cutoff Frequency, MHz (input1) :

Characteristic Impedance, Ohm (input2) :

Inductance(L) in Henries (Output1):

Capacitance (C) in farads (Output2):


*Note: Enter values in INPUT boxes and Press CALCULATE button to check OUTPUTS.

Example of RF Filter Calculator of lowpass type:
INPUTS : Fc =1182.5 MHz, Z0 = 50 Ohm
OUTPUTS: L = 134 micro-henry, C = 5.38 pF

RF lowpass filter calculator equation

Following are the equations used in RF lowpass filter calculator of order N equal to 3. Figure-1 depicts lowpass filter pi and T section topologies. This simple RF filter calculator made of L and C components is very useful.


Simple RF Lowpass Filter Calculator equation

RF filter calculator-Bandpass filter type

Following is a simple LC based RF bandpass filter calculator of order N equal to 3.

BPF Start frequency, MHz (input1) :

BPF End frequency, MHz (input2) :

Characteristic Impedance, Ohm(input3) :

Inductance(L1) in Henries (Output1):

Inductance(L2) in Henries (Output2):

Capacitance(C1) in Farads (Output3):

Capacitance(C2) in Farads (Output4):


Example of RF Filter Calculator of bandpass type:
INPUTS : f1 = 1024.5 MHz, f2 = 1060.5 MHz, Z01 = 50 Ohm
OUTPUTS: L1 = 44 µH , L2 = 13.19 nH , C1 = 527.6 pF , C2 = 17.7 nF

RF Bandpass filter calculator equation

Figure-2 depicts bandpass filter pi and T section topologies. Following are the equations for above mentioned RF bandpass filter topologies.


Simple RF Bandpass Filter Calculator equation

L1 = [ Z0/ (Pi*(f2-f1)) ] ..... Henries

L2 = [ Z0*(f2-f1) / (4*Pi*f2*f1) ] ..... Henries

C1 = [ (f2-f1) / (4*Pi*f2*f1*Z0) ] ..... Farads

C2 = [ 1 / (Pi*Z0*(f2-f1) ] ..... Farads

Refer step by step RF filter design. It covers microstrip based RF/Microwave Low Pass Filter design example along with Kudora's identities, Richard transformation and filter coefficients table for Chebysev LPF.
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